The chief executive officer of the Australian Radiation Protection and Nuclear Safety Agency says Northern Territorians have nothing to fear from a nuclear waste dump.

Dr John Loy says once the Federal Government chooses one of three proposed sites, he will only grant a licence if it meets stringent security tests.

He says he can guarantee that if approved, the dump would be safe.

"I can't issue a licence unless I can be assured, and the process is very much a public one, and I think people will be able to see from the demonstrations the proponent will have to make and from the analysis and the assessment that we do that the result will be something that will be safe," he said.